1. A. Pacz, USA Patent No. 1387900 (1920).
2. M. Hansen, ?Constitution of Binary Alloys? 2nd Edn (McGraw-Hill, New York, Toronto, London, 1958) 132.
3. G. A. Chadwick,Prog. Mater. Sci. 12 (1965) 99.
4. A. Hellawell,ibid. 15 (1970) 3.
5. ASM Metals Handbook, ?Metallography, Structures and Phase-Diagrams?, Vol. 8 (Ohio, 1973) p. 263.